TY - GEN

T1 - Hydrogen diffusion in metals under fatigue failure

AU - Indeitsev, Dmitry

AU - Polyanskii, Vladimir

AU - Semenov, Boris

AU - Sterlin, Mikhail

AU - Yakovlev, Yury

PY - 2012/1/1

Y1 - 2012/1/1

N2 - In our experimental studies it was found that cyclic and long-term static loads lead to a redistribution of the natural concentration of hydrogen in metals both in volume and in the binding energies. The distribution of the hydrogen concentration along the metal sample has a distinct character under uniaxial cyclic loading. It has many extremes with the one major peak. A model describing of phenomenon is proposed. The closed system of the equation is presented. This equation describes the hydrogen transport under the body deformation. These were obtained from the general laws of continuum mechanics and a generalized diffusion equation. Consideration of mutual relations of the diffusion and the deformation processes is in the study actually. The deformation processes is accompanied by vibration and alternating cycles of loading and unloading of the material with hydrogen. Under the transient deformation of the body the movement of hydrogen could be directed against the entropy flux of the hydrogen diffusion. This diffusion leads to the hydrogen localization and, as a result, to the irreversible mechanical degradation embrittlement and failure of the metal in areas in which the diffusion-mobile hydrogen is concentrated. The theoretical results are compared with the experimental data for rods from the aluminum-copper-magnesium alloy. The hydrogen accumulation in the central part of the rods, which is determined in experiments has a good agreement with the theoretical results.

AB - In our experimental studies it was found that cyclic and long-term static loads lead to a redistribution of the natural concentration of hydrogen in metals both in volume and in the binding energies. The distribution of the hydrogen concentration along the metal sample has a distinct character under uniaxial cyclic loading. It has many extremes with the one major peak. A model describing of phenomenon is proposed. The closed system of the equation is presented. This equation describes the hydrogen transport under the body deformation. These were obtained from the general laws of continuum mechanics and a generalized diffusion equation. Consideration of mutual relations of the diffusion and the deformation processes is in the study actually. The deformation processes is accompanied by vibration and alternating cycles of loading and unloading of the material with hydrogen. Under the transient deformation of the body the movement of hydrogen could be directed against the entropy flux of the hydrogen diffusion. This diffusion leads to the hydrogen localization and, as a result, to the irreversible mechanical degradation embrittlement and failure of the metal in areas in which the diffusion-mobile hydrogen is concentrated. The theoretical results are compared with the experimental data for rods from the aluminum-copper-magnesium alloy. The hydrogen accumulation in the central part of the rods, which is determined in experiments has a good agreement with the theoretical results.

KW - Cycling loading

KW - Diffusion

KW - Embrittlement

KW - Hydrogen

KW - Mechanical degradation

UR - http://www.scopus.com/inward/record.url?scp=84905457909&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84905457909

SN - 978-5-905576-18-8

T3 - 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012

BT - 19th European Conference on Fracture

PB - Фолиант

T2 - 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012

Y2 - 26 August 2012 through 31 August 2012

ER -